<template>
  <div class="my-counter">
    <button type="button" class="btn btn-light" @click="change('-')">-</button>
    <input type="number" class="form-control inp" v-model="obj.goods_count" />
    <button type="button" class="btn btn-light" @click="change('+')">+</button>
  </div>
</template>

<script>
export default {
  // props: {    //只读 不能修改
  //   sum: {
  //     type: Number,
  //   },
  // },
  props: {
    obj: {
      type: Object,
    },
  },
  methods: {
    change(val) {
      if (val == "-") {
        this.obj.goods_count <= 1
          ? (this.obj.goods_count = 1)
          : this.obj.goods_count--;
      } else {
        this.obj.goods_count++;
      }
    },
  },
};
</script>

<style lang="less" scoped>
.my-counter {
  display: flex;
  .inp {
    width: 45px;
    text-align: center;
    margin: 0 10px;
  }
  .btn,
  .inp {
    transform: scale(0.9);
  }
}
</style>